Precision-engineered miniature circuit breakers, residual current devices, and distribution switchgear built for industrial, commercial, and energy distribution applications.
An in-depth analysis of low-voltage protective equipment, circuit breaker arc suppression technologies, industrial overload protection, and high-capacity global distribution networks.
Founded in 2013, Wenzhou OFA Electrical Technology Co., Ltd. is a premier global supplier of distribution switchgear and control equipment. Located in Yueqing, Wenzhou—widely recognized as the "Capital of Electrical Appliances in China"—OFA combines advanced localized industrial infrastructure with world-class engineering standards.
Operating under proprietary brand labels such as "OFA", the company delivers comprehensive power distribution, circuit protection, and industrial automation solutions across more than 100 countries. OFA has maintained a Tax Credit Grade A rating for seven consecutive years, cementing its reputation as a trustworthy, transparent, and quality-driven B2B manufacturing partner.
The OFD4Z7 Series Miniature Circuit Breaker represents the pinnacle of modern terminal power distribution safety. Designed to handle severe electrical faults, the OFD4Z7 series provides high-precision overload and short-circuit protection for residential, commercial, and heavy industrial switchboards.
Detailed electrical parameters designed to exceed international standards including IEC/EN 60898-1 and IEC/EN 60947-2.
| Electrical Parameter | Specification Detail (OFD4Z7 Series) | Application Benchmark |
|---|---|---|
| Number of Poles (P) | 1P, 2P, 3P, 4P, 1P+N, 3P+N | Single-phase & Three-phase industrial sub-panels |
| Rated Current (In) | 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A | Precision load customization & motor protection |
| Rated Operational Voltage (Ue) | 230V / 400V AC (50/60 Hz), DC variants available | Universal global grid compatibility |
| Rated Breaking Capacity (Icn) | 6,000A (6kA) / 10,000A (10kA) | High fault-level industrial distribution boards |
| Tripping Characteristics | B Curve (3-5 In), C Curve (5-10 In), D Curve (10-14 In) | Lighting, resistive, inductive & motor starting loads |
| Insulation Voltage (Ui) & Impulse (Uimp) | 500V AC | Uimp: 4kV (1.2/50μs) | Resilience against transient voltage spikes & lightning surges |
| Housing Material & Flame Retardancy | High-rigidity polyamide PA66, UL94 V-0 non-flammable | Thermal stability up to 125°C under fault heat |
| Electrical / Mechanical Endurance | 10,000 Operations (Electrical) | 20,000 Operations (Mechanical) | Extended asset service lifecycle (>15 years) |
How OFD4Z7 miniature circuit breakers serve vital global sectors, supporting power quality, green energy transitions, and uninterrupted industrial operations.
With global shifts toward clean energy, OFD4Z7 DC-specialized and AC grid-tie breakers safeguard inverter output distribution boxes, string combiners, and battery energy storage systems (BESS). Their thermal stability prevents nuisance trips under high ambient temperatures found in desert solar farms.
Rapid expansion of Electric Vehicle Supply Equipment (EVSE) demands protection components capable of resisting severe current surges. OFD4Z7 MCBs, combined with OFA’s Type A/B RCCBs, protect AC wallboxes and DC fast-charging terminals from residual current leakage and harmonic distortion.
Hyperscale data facilities require uninterrupted uptime. The selective coordination offered by OFD4Z7 (C and D curves) ensures localized isolation of fault lines in Power Distribution Units (PDUs) without triggering upstream main supply shutoffs.
Modern commercial complexes use smart distribution cabinets containing high densities of switching devices. The compact 18mm per pole footprint of OFD4Z7 saves valuable DIN-rail panel space while offering clean aesthetic integration.
Machinery manufacturers require protective switchgear capable of handling heavy inductive inrush currents during motor startups. The OFD4Z7 D-curve breaker prevents nuisance tripping while protecting sensitive PLC controllers and VFD drives.
From municipal water treatment plants to smart street lighting grids, OFD4Z7 units operate in extreme environmental conditions, offering reliable protection against ground faults and transient power surges.
Leveraging localized supply chains, highly automated production lines, and strict quality control standard operating procedures (SOPs) to deliver unmatched price-to-performance ratios.
Wenzhou OFA Electrical Technology Co., Ltd. operates in Yueqing—the world’s largest manufacturing ecosystem for low-voltage electrical apparatus. This location gives OFA immediate access to ultra-high-purity copper, silver contacts, specialized flame-retardant polymers, and high-precision stamping dies within a 10-kilometer radius.
This industrial density reduces component procurement lead times, eliminates cross-border logistics friction during assembly, and enables OFA to respond swiftly to custom OEM/ODM production requirements.
OFA’s modern production facilities feature multi-station automated assembly machinery, robotic calibration systems, and Automated Optical Inspection (AOI) units. Every OFD4Z7 breaker undergoes rigorous factory testing:
Explore our full line of Molded Case Circuit Breakers (MCCB), Miniature Circuit Breakers (MCB), Air Circuit Breakers (ACB), Residual Current Breakers (RCCB/RCBO), and Isolator Switches (IS).
Designed to make, carry, and break currents under normal circuit conditions, and interrupt abnormal fault conditions such as overloads and short circuits in high-capacity distribution networks.
MCCB BA88 Electronic Series
Electronic trip design for adjustable main incoming protection.
MCCB DCM1 Series
Industrial-grade breaking capacity for heavy loads.
MCCB DCOF1 Series
Compact structure with reliable thermal-magnetic protection.
MCCB OFM1 Series
High fault breaking capacity for panel builders.
The vital defense line for low-voltage power distribution. Compact, high-breaking capacity devices engineered for seamless DIN-rail installation.
OF6KA Series MCB
6kA breaking capacity for standard commercial panels.
OF10KA C65 Series MCB
Heavy-duty 10kA rated breaker for industrial switchboards.
OFD4Z7 Flagship Series
Flagship thermal-magnetic overcurrent series.
OFDL Series MCB
Modular terminal protection breaker.
Combining overload, short-circuit, and high-sensitivity earth leakage current protection to prevent electric shocks and electrically induced fires.
OFC Series RCBO
Integrated 1P+N residual protection unit saving 50% enclosure space.
OFAP6-AC Series RCCB
Dedicated AC fault-current detection switch for sub-circuits.
OFIS-125A Isolator Switch
High-current isolation switch ensuring safe maintenance disconnections.
How global system integrators, EPC contractors, and brand distributors collaborate with OFA for streamlined procurement and custom product engineering.
For standard electrical retrofits, commercial construction, or routine inventory replenishment:
For custom housing branding, special voltage curves, or specialized enclosure designs:
Real feedback from technical directors, maintenance managers, and project engineers relying on OFA products worldwide.
"Collaborating with OFA on our industrial automation panels across Poland simplified our supply chain immensely. The OFD4Z7 series shows zero component variation across batches, and trip testing perfectly matches our engineering specifications."
Andrzej Nowak Technical Director, Automation System Integrator (Poland)"We upgraded our plant distribution switchboards with OFA intelligent monitoring devices and OFD4Z7 MCBs. The system has operated faultlessly for over two years under demanding thermal conditions."
Markus Weber Plant Maintenance Manager (Germany)"Deploying OFA's energy efficiency platform and protective breakers for our commercial towers in Bangkok yielded immediate reliability gains. The remote technical support team guided us step-by-step during commissioning."
Priya Sharma Facilities Engineering Supervisor (Thailand)Everything you need to know about OFD4Z7 Miniature Circuit Breakers, factory customization, quality standards, and export logistics.
Complete your panel distribution architecture with our full line of miniature circuit breakers, earth leakage units, and switchgear components.
OFA Electrical
